Abstract
A new parabathynellid bathynellacean species, Hangangbathynella mihoensissp. nov., was found in the groundwater of the Geumgang River in South Korea. This is the first report of Hangangbathynella from a tributary of the Geumgang River. All previously-reported species were found in the Hangang River and the origins of the two rivers are distinct from each other. The new species can be distinguished from its congeners by the two-segmented mandibular palp and the absence of epipods on thoracopod II. In this study, we provide a description of the new species and an identification table for the genus Hangangbathynella. In addition, we obtained partial sequences of the mitochondrial cytochrome c oxidase subunit I gene for DNA barcoding.
Highlights
Bathynellacea Chappuis, 1915 is an order of groundwater crustaceans, known to have high levels of endemism owing to their limited dispersal capacity (Camacho et al 2012)
Antennule seven-segmented without aesthetascs on the fifth segment, and with three simple setae on inner distal margin of the sixth segment; antenna sevensegmented with setal formula 0 + 0/0 + 0/1 + 0/1 + 1/0 + 0/0 + 2/4(1); labrum with 14 teeth; mandible palp two-segmented; maxilla four-segmented with setal formula 3-3(2)-10-6; exopod of thoracopods I–VII two-segmented; thoracopods III–VII each with an epipod; inner protuberance of male thoracopod VIII with three distal spinules; female thoracopod VIII with two teeth and two distal setae; uropod sympod with 8 to 10 spines of similar size; furcal ramus with 4 to 5 spines; anal operculum protruded
The new species belongs to the genus Hangangbathynella, and species of this genus have been recorded only in the Hangang River to date (Park and Cho 2013)
Summary
Bathynellacea Chappuis, 1915 is an order of groundwater crustaceans, known to have high levels of endemism owing to their limited dispersal capacity (Camacho et al 2012). The group exclusively inhabits fresh and brackish subterranean waters and is distributed throughout all continents except Antarctica (Camacho et al 2012). They have no eyes, simplified appendages, and a reduced number of segments in the antennule, antenna, mouthpart structures and thoracopods. 30 species of the family Parabathynellidae, belonging to five genera, have been described from South Korea (Morimoto 1970; Cho et al 2008; Park and Cho 2008, 2013, 2015a, b, 2016; Schminke 2011; Park and Eun 2012; Shin 2014): 17 species of Allobathynella Morimoto & Miura, 1957, two of Eobathynella Birstein & Ljovuschkin, 1964, four of Nipponbathynella Schminke, 1973, three of Arisubathynella Park & Eun, 2012, and four of Hangangbathynella Park & Cho, 2013. Hangangbathynella specimens were first collected during field surveys of groundwater habitats of the tributary of the Geumgang River in the Korean Peninsula. We obtained mitochondrial cytochrome c oxidase subunit I (COI) gene sequence data for molecular barcoding and provide an identification table to species of the genus Hangangbathynella
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